Lichen removal
 

I have lichen and mold on my asphalt tile roof that is about 1000 sq ft.(roof is about 15 yrs old) What is the typical charge per sq ft for a cleaning service to remove this material.

Go to web sites listed on the right side of this forum, e.g.,
http://www.wash-safe.com/merchant.mv...FSENDQodDmMxrQ

I think copper powder or Cu salts will stop moss growth.

lichen
 

vioilin,

Thanks for the tip. I'll give it a try.